1、液壓密封件之形式選擇

　　在(zai)液壓系統中(zhong)，常見的密(mi)封形(xing)式有(you)擠壓型(xing)O形(xing)密(mi)封圈(quan)(quan)、Y形(xing)圈(quan)(quan)、V形(xing)圈(quan)(quan)、U形(xing)圈(quan)(quan)唇形(xing)密(mi)封。唇形(xing)密(mi)封圈(quan)(quan)主要(yao)用于(yu)往復(fu)動密(mi)封，與(yu)O形(xing)圈(quan)(quan)等(deng)擠壓密(mi)封相比，往復(fu)動密(mi)封使用唇形(xing)密(mi)封圈(quan)(quan)具有(you)更好的綜合性能(neng)和(he)更長的使用壽(shou)命。

　　唇(chun)形(xing)密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)(quan)的(de)(de)密(mi)(mi)(mi)封(feng)(feng)壓(ya)(ya)(ya)(ya)緊力(li)(li)是隨介質壓(ya)(ya)(ya)(ya)力(li)(li)的(de)(de)改變而(er)變化的(de)(de)，工作中始終應監控介質壓(ya)(ya)(ya)(ya)力(li)(li)的(de)(de)變化，即(ji)能(neng)保證(zheng)足夠(gou)的(de)(de)密(mi)(mi)(mi)封(feng)(feng)壓(ya)(ya)(ya)(ya)緊力(li)(li)，又(you)不至于(yu)產生(sheng)過大(da)(da)的(de)(de)摩(mo)擦力(li)(li)，擠壓(ya)(ya)(ya)(ya)性密(mi)(mi)(mi)封(feng)(feng)主要(yao)靠(kao)預壓(ya)(ya)(ya)(ya)緊力(li)(li)產生(sheng)密(mi)(mi)(mi)封(feng)(feng)力(li)(li)，密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)(quan)接觸壓(ya)(ya)(ya)(ya)力(li)(li)預先(xian)給定，工作中不能(neng)根據介質壓(ya)(ya)(ya)(ya)力(li)(li)的(de)(de)改變而(er)變化。大(da)(da)的(de)(de)預壓(ya)(ya)(ya)(ya)力(li)(li)會使密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)(quan)與密(mi)(mi)(mi)封(feng)(feng)面接觸面積(ji)增大(da)(da)，產生(sheng)很大(da)(da)的(de)(de)摩(mo)擦阻力(li)(li)，過大(da)(da)的(de)(de)摩(mo)擦力(li)(li)會造(zao)成密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)(quan)的(de)(de)破損，在低壓(ya)(ya)(ya)(ya)時造(zao)成啟(qi)動困難，或產生(sheng)爬行現(xian)象，唇(chun)形(xing)密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)(quan)可以通過唇(chun)部撐開(kai)，變形(xing)補償(chang)小的(de)(de)磨損量(liang)(liang)，保證(zheng)密(mi)(mi)(mi)封(feng)(feng)效果和密(mi)(mi)(mi)封(feng)(feng)壽命;而(er)O形(xing)圈(quan)(quan)(quan)隨著(zhu)摩(mo)擦余量(liang)(liang)的(de)(de)減少，直(zhi)接影響(xiang)其密(mi)(mi)(mi)封(feng)(feng)性。

　　2、液壓密封件之材(cai)料選擇

　　密封(feng)(feng)(feng)件(jian)形(xing)式(shi)和結構現(xian)(xian)在(zai)一(yi)(yi)般(ban)已經定型，各(ge)密封(feng)(feng)(feng)件(jian)質(zhi)量(liang)區(qu)別主(zhu)要在(zai)于制作(zuo)材(cai)料(liao)(liao)上。密封(feng)(feng)(feng)材(cai)料(liao)(liao)主(zhu)要使用橡膠和合成樹脂。由于各(ge)種材(cai)料(liao)(liao)性(xing)(xing)能特(te)點不(bu)同(tong)(tong)(tong)(tong)，性(xing)(xing)能特(te)點不(bu)同(tong)(tong)(tong)(tong)，用途也就(jiu)有(you)(you)(you)(you)(you)所不(bu)同(tong)(tong)(tong)(tong)。選用時需根據不(bu)同(tong)(tong)(tong)(tong)的(de)(de)使用條件(jian)和不(bu)同(tong)(tong)(tong)(tong)的(de)(de)使用條件(jian)作(zuo)出合適的(de)(de)選擇。另(ling)(ling)外，某(mou)一(yi)(yi)材(cai)質(zhi)的(de)(de)密封(feng)(feng)(feng)對被密封(feng)(feng)(feng)的(de)(de)某(mou)一(yi)(yi)工作(zuo)介質(zhi)(如礦物油等(deng))表現(xian)(xian)較好的(de)(de)密封(feng)(feng)(feng)性(xing)(xing)能，而對另(ling)(ling)一(yi)(yi)介質(zhi)表現(xian)(xian)極差，這(zhe)就(jiu)是密封(feng)(feng)(feng)材(cai)料(liao)(liao)與液壓油的(de)(de)相(xiang)容(rong)性(xing)(xing)。還有(you)(you)(you)(you)(you)，各(ge)種不(bu)同(tong)(tong)(tong)(tong)的(de)(de)密封(feng)(feng)(feng)材(cai)料(liao)(liao)對你不(bu)同(tong)(tong)(tong)(tong)的(de)(de)工作(zuo)條件(jian)表現(xian)(xian)出不(bu)同(tong)(tong)(tong)(tong)的(de)(de)性(xing)(xing)能。有(you)(you)(you)(you)(you)些(xie)耐(nai)熱，有(you)(you)(you)(you)(you)些(xie)不(bu)耐(nai)熱;有(you)(you)(you)(you)(you)些(xie)耐(nai)酸，有(you)(you)(you)(you)(you)些(xie)耐(nai)堿，有(you)(you)(you)(you)(you)些(xie)耐(nai)水，有(you)(you)(you)(you)(you)些(xie)耐(nai)油;有(you)(you)(you)(you)(you)些(xie)抗熱，有(you)(you)(you)(you)(you)些(xie)耐(nai)低溫，有(you)(you)(you)(you)(you)些(xie)耐(nai)高(gao)溫，等(deng)等(deng)。這(zhe)些(xie)因素(su)在(zai)考(kao)慮(lv)密封(feng)(feng)(feng)件(jian)材(cai)料(liao)(liao)的(de)(de)時候(hou)需注意(yi)。